package com.qf.filter;

import javax.servlet.*;
import javax.servlet.annotation.WebFilter;
import java.io.IOException;

/**
 * 请求访问会第一个先进入这个过滤器, 过滤器处理完成放行后才会进入servlet
 * 字符集乱码处理过滤器
 */
@WebFilter("/*")
public class EncodingFilter implements Filter {

    @Override
    public void init(FilterConfig filterConfig) throws ServletException {

    }

    @Override
    public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse, FilterChain filterChain) throws IOException, ServletException {
        //处理请求对象字符集编码
        servletRequest.setCharacterEncoding("utf-8");
        //处理响应对象字符集编码
        servletResponse.setCharacterEncoding("utf-8");
        servletResponse.setContentType("text/html;charset=utf-8");

        //放行请求, 到下一个过滤器
        filterChain.doFilter(servletRequest, servletResponse);
    }

    @Override
    public void destroy() {

    }

}
